The Data of Influence of the Acidity on the Performance of Propylene Oligomerization over HZSM-5 Catalysts

It shows the morphology of the HZSM-5 zeolite catalysts, labeled as SEM (a), SEM (b), SEM (c), and SEM (d). These images visually display the hexagonal prism morphology and grain dispersion degree of four zeolites with different silica-to-alumina ratios: HZSM-5-30, HZSM-5-50, HZSM-5-90, and HZSM-5-120.Figure 3: Nitrogen physisorption measurements conducted using a Microtrac MRB Belsorp max X analyzer. This figure presents the adsorption-desorption isotherms of HZSM-5-30, HZSM-5-50, HZSM-5-90, and HZSM-5-120 zeolites with different silica-to-alumina ratios.

It shows the actual gas adsorption capacity of the samples under different pressures and represents the raw experimental data for BET analysis.Figure 4: NH3-TPD desorption curves. Acidity characterization was performed using NH₃ temperature-programmed desorption. This figure mainly shows the NH₃ desorption curves of HZSM-5-30, HZSM-5-50, HZSM-5-90, and HZSM-5-120 zeolites with increasing temperature, characterizing the acid amount and acid strength of the catalysts.Figure 5: Py-FTIR spectra of HZSM-5 catalysts with different silica-to-alumina ratios, used to analyze the types of acid sites in HZSM-5-30, HZSM-5-50, HZSM-5-90, and HZSM-5-120 zeolites.Figure 6: Evaluation of propylene oligomerization performance for HZSM-5 catalysts with different silica-to-alumina ratios at various reaction temperatures.

The data were obtained from temperature-programmed evaluation in a fixed-bed reactor. The x-axis represents temperature, and the y-axis represents the oil yield from propylene oligomerization.Figure 7: Product distribution of HZSM-5 catalysts with different silica-to-alumina ratios at the maximum oil yield, mainly including carbon number distribution and product type distribution. The data were obtained from a fixed-bed evaluation unit.

This primarily investigates the effect of the silica-to-alumina ratio (acidity) on the product distribution and carbon number distribution of propylene oligomerization over HZSM-5 zeolites.